error with addon domains

hi
i have reseller plan, my problem is that i can't addon domains, i receive this message
"Error from park wrapper: Sorry, cannot determine nameserver IPs. Please make sure that the domain is registered with a valid domain registrar."
What should I do?
regards

I am a little new to CPanel and server management, but I had this error and corrected it with the following:

Before you create an addon domain on your hosting account - the domain MUST exist at your registrar's and the nameservers for this domain MUST be pointing to the nameservers of your hosting account. At least that is what worked in my situation.

You can get a lot of debugging done with the "dig" command.

For instance:

dig yourdomain.com - will give the IP your domain is registered at, as well as the IP's of the nameservers being used by your registrar.

dig @nameserver.com yourdomain.com will give you the nameserver's reference for your domain.